.classes-box {
    margin: 0 20px;
    padding: 10px 10px;
    width: 1200px;
    height: 40px;
    box-shadow: rgba(99, 100, 100, 0.2) 0 2px 8px 0;
    border-bottom: #f3eeee 2px solid;
}

.classes-box .top-nav {
    display: inline-block;
}

.classes-box .top-nav a {
    display: block;
    border-radius: 5px;
    margin-right: 20px;
    padding: 3px 10px;
    background-color: #aaa7a7;

}

.classes-box .top-nav a:hover {
    background-color: #555666;
}